A configuration method of a-type lightning arrester in converter station

Abstract

The present invention provides a configuration method of a convertor station A-type lightning arrester, and relates to the electric power grid technology field. The configuration method can suppress an overvoltage on an AC bus under the premises of not increasing the equipment investment cost excessively, and guaranteeing the equipment reliability, and comprises the steps of building a DC power transmission system simulation model, configuring the A-type lightning arresters at the converter transformer AC grid side of a convertor station in the built simulation model and on the AC filter largegroup buses, calculating a recovery voltage between the circuit breaker ends under an island operation mode and when the bipolar emergency total outage occurs; determining whether the calculated recovery voltage exceeds a voltage that a dual-port circuit breaker can withstand; if yes, configuring the A-type lightning arresters at the converter transformer AC grid side and between the AC filter small groups and the corresponding circuit breakers; if not, configuring the A-type lightning arresters at the converter transformer AC grid side and on the AC filter large group buses.

Description

technical field [0001] The invention relates to the technical field of power grids, in particular to a method for configuring a type A arrester of a converter station. Background technique [0002] A certain number of A-type surge arresters are usually installed on the AC side of the converter station of the DC transmission system to limit the operating overvoltage from the AC side and protect the equipment on the AC bus. Such as figure 1 As shown, according to the principle of arrester configuration in converter stations, important equipment should be directly protected by arresters close to each other. Therefore, in the traditional A-type arrester configuration scheme, some A-type arresters 12 are usually arranged in the AC network of the converter transformer 11. The side incoming line directly protects the converter transformer 11; the other part of the A-type arrester 12 is usually arranged on the busbar 15 of the AC filter large group to directly protect the filter eq...

AI Technical Summary

Problems solved by technology

However, this processing method significantly increases the number of parallel connections of A-type arresters 12 on the AC bus 15, which on the one hand leads to an increase in equipment investment costs, and on the other hand easily leads to uneven current distribution of A-type arresters 12 and affects the life of the equipment.

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